[Core] Support tensor parallelism for GGUF quantization (#7520)

tests/models/test_gguf.py

@@ -7,6 +7,7 @@ import os
 
 import pytest
 from huggingface_hub import hf_hub_download
+from transformers import AutoTokenizer
 
 from tests.quantization.utils import is_quant_method_supported
 
@@ -20,7 +21,7 @@ MAX_MODEL_LEN = 1024
 MODELS = [
     ("TinyLlama/TinyLlama-1.1B-Chat-v1.0",
      hf_hub_download("TheBloke/TinyLlama-1.1B-Chat-v1.0-GGUF",
-                     filename="tinyllama-1.1b-chat-v1.0.Q4_0.gguf")),
+                     filename="tinyllama-1.1b-chat-v1.0.Q4_K_M.gguf")),
     ("TinyLlama/TinyLlama-1.1B-Chat-v1.0",
      hf_hub_download("duyntnet/TinyLlama-1.1B-Chat-v1.0-imatrix-GGUF",
                      filename="TinyLlama-1.1B-Chat-v1.0-IQ4_XS.gguf")),
@@ -39,22 +40,36 @@ MODELS = [
 @pytest.mark.parametrize("dtype", ["half"])
 @pytest.mark.parametrize("max_tokens", [32])
 @pytest.mark.parametrize("num_logprobs", [5])
+@pytest.mark.parametrize("tp_size", [1, 2])
 def test_models(
+    num_gpus_available,
     vllm_runner,
     example_prompts,
     model,
     dtype: str,
     max_tokens: int,
     num_logprobs: int,
+    tp_size: int,
 ) -> None:
+    if num_gpus_available < tp_size:
+        pytest.skip(f"Not enough GPUs for tensor parallelism {tp_size}")
+
     original_model, gguf_model = model
 
+    tokenizer = AutoTokenizer.from_pretrained(original_model)
+    messages = [[{
+        'role': 'user',
+        'content': prompt
+    }] for prompt in example_prompts]
+    example_prompts = tokenizer.apply_chat_template(messages,
+                                                    tokenize=False,
+                                                    add_generation_prompt=True)
+
     # Run unquantized model.
     with vllm_runner(model_name=original_model,
                      dtype=dtype,
                      max_model_len=MAX_MODEL_LEN,
-                     enforce_eager=True,
-                     tensor_parallel_size=1) as original_model:
+                     tensor_parallel_size=tp_size) as original_model:
 
         original_outputs = original_model.generate_greedy_logprobs(
             example_prompts[:-1], max_tokens, num_logprobs)
@@ -63,8 +78,7 @@ def test_models(
     with vllm_runner(model_name=gguf_model,
                      dtype=dtype,
                      max_model_len=MAX_MODEL_LEN,
-                     enforce_eager=True,
-                     tensor_parallel_size=1) as gguf_model:
+                     tensor_parallel_size=tp_size) as gguf_model:
         gguf_outputs = gguf_model.generate_greedy_logprobs(
             example_prompts[:-1], max_tokens, num_logprobs)
 

vllm/model_executor/layers/linear.py

@@ -507,11 +507,16 @@ class MergedColumnParallelLinear(ColumnParallelLinear):
                     loaded_shard_id
 
             if is_gguf_weight:
-                shard_size = loaded_weight.shape[output_dim]
-                shard_offset = loaded_weight.shape[output_dim] * \
-                    loaded_shard_id
+                tp_size = get_tensor_model_parallel_world_size()
+                output_dim = getattr(param, "output_dim", None)
+                shard_shape = list(loaded_weight.shape)
+                shard_shape[output_dim] = shard_shape[output_dim] // tp_size
                 param.shard_id.append(loaded_shard_id)
-                param.shard_size[loaded_shard_id] = loaded_weight.shape
+                param.shard_size[loaded_shard_id] = shard_shape
+
+                input_dim = getattr(param, "input_dim", None)
+                input_size = loaded_weight.shape[input_dim]
+                param_data = param_data.narrow(input_dim, 0, input_size)
 
             param_data = param_data.narrow(output_dim, shard_offset,
                                            shard_size)
@@ -863,8 +868,13 @@ class QKVParallelLinear(ColumnParallelLinear):
                     param, orig_qkv_offsets, loaded_shard_id)
 
             if is_gguf_weight:
+                tp_size = get_tensor_model_parallel_world_size()
+                output_dim = getattr(param, "output_dim", None)
+                shard_shape = list(loaded_weight.shape)
+                shard_shape[output_dim] = shard_shape[output_dim] // tp_size
                 param.shard_id.append(loaded_shard_id)
-                param.shard_size[loaded_shard_id] = loaded_weight.shape
+                param.shard_size[loaded_shard_id] = shard_shape
+
                 input_dim = getattr(param, "input_dim", None)
                 input_size = loaded_weight.shape[input_dim]
                 param_data = param_data.narrow(input_dim, 0, input_size)
@@ -976,6 +986,7 @@ class RowParallelLinear(LinearBase):
 
     def weight_loader(self, param: Parameter, loaded_weight: torch.Tensor):
         tp_rank = get_tensor_model_parallel_rank()
+        tp_size = get_tensor_model_parallel_world_size()
         input_dim = getattr(param, "input_dim", None)
 
         # Special case for GGUF
@@ -986,7 +997,10 @@ class RowParallelLinear(LinearBase):
 
         # Materialize GGUF UninitializedParameter
         if is_gguf_weight and isinstance(param, UninitializedParameter):
-            param.materialize(loaded_weight.shape, dtype=loaded_weight.dtype)
+            weight_shape = list(loaded_weight.shape)
+            if input_dim:
+                weight_shape[input_dim] = weight_shape[input_dim] // tp_size
+            param.materialize(tuple(weight_shape), dtype=loaded_weight.dtype)
 
         param_data = param.data
         if input_dim is not None:

vllm/model_executor/layers/quantization/gguf.py

@@ -5,7 +5,6 @@ import torch
 from torch.nn.parameter import Parameter, UninitializedParameter
 
 from vllm import _custom_ops as ops
-from vllm.distributed import get_tensor_model_parallel_world_size
 from vllm.model_executor.layers.linear import LinearBase, LinearMethodBase
 from vllm.model_executor.layers.quantization.base_config import (
     QuantizationConfig, QuantizeMethodBase)
@@ -39,9 +38,6 @@ class GGUFConfig(QuantizationConfig):
 
     @classmethod
     def from_config(cls, config: Dict[str, Any]) -> "GGUFConfig":
-        if get_tensor_model_parallel_world_size() > 1:
-            raise ValueError(
-                "GGUF quantization hasn't supported tensor parallelism yet.")
         return cls()
 
     def get_quant_method(self, layer: torch.nn.Module,